What he was asking is, is that a 2.5 inch hard drive or a 3.5 inch hard drive.
Its a 3.5 incher USB 3.0 @ 5400RPM.
Source - LaCie Porsche Design P?9220
May want to post a pic of the invoice as well?
its a 2.5 incher. the link clearly says its usb powered.
and ygpm